A moving novel about four lifelong friends, the milestones they've survived ... and the one thing that might change everythingThere are certain events you'll always remember where you were and who you were with ... and the friends who have commiserated and celebrated every amazing first date, bad breakup, dubious haircut, and dream job along the way.Sophie, Emily, Amy, and Melissa have been best friends since they were girls. They have seen each other through everything-from Sophie's private fear that she doesn't actually want to be a mother despite being mom to two kids, to Amy's perfect-on-the-outside marriage that starts to reveal troubling warning signs, to Melissa's spiraling alcoholism, to questions around the paternity of Emily's son. But could a lie that spans just as long as their friendship be the thing that tears them apart? Four friends. Twenty years. One powerful secret.